HD Content Playback Poor

Description

It appears that Quicktime is not capable of playing back HD content in formats such as MKV or other native formats. The only way HD plays back in Quicktime is when its been converted to be iTunes friendly. This is the case even when using Perian. VLC on the other hand does a wonderful job of decoding virtually any HD format. It would be a great feature to be able to use VLC as the playback engine instead of Quicktime.